Australian Water Information Dictionary
tolerance
Root sum squared combination of instrument error and reference error. Tolerance is calculated as
Tolerance = ±√(A²+ B²)
where:
A = instrument error from manufacturer’s specifications confirmed by calibration (e.g. ±3 mm for this range); and
B = ability to read reference reading (e.g. gauge plate can be read to ±4 mm).
This definition applies to: